seventy-third I. \| ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 73 in a countable series < the seventy-third day > — see number table 2.: being one of 73 equal parts into which something is divisible < a seventy-third share of the money > II. noun 1.: number 73 in a countable series 2.: the quotient of a unit divided by 73 : one of 73 equal parts of something < one seventy-third of the total >